Hello I just install in one of my pc , the Sims 3 , with thoses additional pack :Genaration Ambition World adventure Pets Show time And late night

After installed all those pack with the correct way to do it ( like you told us ) , The game start , it works weel until i arrived in any kind of city . At this point the city is'nt fully represent and there is grey spot all over , like triangle and square . I instal the same games , but world adventure in another pc and it worked fine .Can you please help me to solve this problem ? thank you

Sounds like a graphics issue. Although, depending on your pc, it is possible that it just needs a little time to render the correct graphical representation. Does it get better after a little while? If it doesn't, try updating your graphics drivers.